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Building Simulation: Ten Challenges

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Building Simulation: Ten Challenges Building Simulation: Ten Challenges Tianzhen Hong*, Jared Langevin, Kaiyu Sun Building Technology and Urban Systems Division Lawrence Berkeley National Laboratory Berkeley, California 94720, USA *Corresponding author. T. Hong. [email protected], 1(510)486-7082 Abstract Buildings consume more than one-third of the world’s primary energy. Reducing energy use and greenhouse-gas emissions in the buildings sector through energy conservation and efficiency improvements constitutes a key strategy for achieving global energy and environmental goals. Building performance simulation has been increasingly used as a tool for designing, operating and retrofitting buildings to save energy and utility costs. However, opportunities remain for researchers, software developers, practitioners and policymakers to maximize the value of building performance simulation in the design and operation of low energy buildings and communities that leverage interdisciplinary approaches to integrate humans, buildings, and the power grid at a large scale. This paper presents ten challenges that highlight some of the most important issues in building performance simulation, covering the full building life cycle and a wide range of modeling scales. The formulation and discussion of each challenge aims to provide insights into the state-of-the-art and future research opportunities for each topic, and to inspire new questions from young researchers in this field. Keywords Building energy use, energy efficiency, building performance simulation, energy modeling, building life cycle, zero-net-energy buildings Introduction The buildings sector consumes about 40% of primary energy in the United States and European countries and about 25%-30% in developing countries like China. In the United States, federal, state and local governments set stringent energy goals for new and existing buildings. For example, in the 2016 multi-year program plan (U.S. Department of Energy 2016), the U.S. Department of Energy’s Building Technologies Office set a goal to reduce the energy use intensity (EUI) of buildings by 30% by 2030 and 50% over the long-term. At the state level, California’s long-term energy efficiency strategic plan (California Public Utilities Commission 2008) stipulates that all new residential buildings must be zero-net-energy (ZNE) by 2020, all new commercial buildings must be ZNE by 2030, and 50% of existing commercial buildings must be retrofitted to ZNE by 2030. At the city level, the City of San Francisco requires all new municipal construction projects of 5,000 square feet or larger to be LEED Gold certified; several other U.S. cities have similar new construction requirements. Building performance simulation (BPS) – also known as building simulation, building energy modeling, or energy simulation - has played a growing role in the design and operation of low energy, high-performance buildings and development of policies that drive the achievement of the aforementioned energy goals. BPS is defined as the use of computational mathematical models to represent the physical characteristics, expected or actual operation, and control strategies of a building (or buildings) and its (their) energy systems. BPS calculations include building energy flows, air flows, energy use, thermal comfort and other indoor environmental quality indexes (e.g., glare).1 BPS has a decades-long history of development, beginning with the replacement of manual procedures with computing tools to determine HVAC loads in the 1960s (Clark, 2001 and 2015; Hensen and Roberto, 2011; BEMBook 2018). Several review articles (e.g., Hong et al. 2000; Li and Wen, 2014; Clarke 2015; Clarke and Hensen 2015; Wang and Zhai 2016; Østergård et al. 2016; Harish and Kumar 2016) survey key developments, applications and challenges for the BPS field across its history. BPS development has been particularly pronounced in the past ten years, as demonstrated by the founding of two new journals in 2008, Building Performance Simulation and Building Simulation, as well as the growth of the International Building Performance Simulation Association (IBPSA), which was formed in 1987. In parallel, several international research efforts under the International Energy Agency (IEA)’s Energy in Buildings and Communities (EBC) Programme have advanced the application of BPS to support the design of buildings and communities (Hong 2018). Key BPS- related IEA EBC projects include: Annex 1, which developed algorithms to determine load and energy of existing buidings; Annex 10, which focused on building HVAC system simulation; Annex 21 and 43, which developed standard methods and test cases to validate and benchmark BPS programs; Annex 30, which provided best practices to integrate simulation in various phases of building design; Annex 53, which used BPS to analyze impact of six influencing factors of real building performance (Yoshino et al. 2017); Annex 58, which studied methods and collected data 1 For a more detailed overview of BPS, see the U.S. Department of Energy’s “101” articles (Roth 2017) on building energy modeling and major use cases including architectural design, HVAC design and operation, building performance rating, and building stock analysis. for full-scale empirical validation of detailed BPS Programs; Annex 60, which developed a Modelica-based library of building energy system component models (Wetter et al. 2015); Annex 66 (Yan et al. 2017), which developed new data, methods, modeling tools and case studies to understand, model and quantify occupant behavior in buildings; and Annex 22, 51 and 73, which studied energy efficient communities. From a practical perspective, BPS is commonly used to: (1) perform load calculations in support of HVAC equipment selection and sizing, (2) demonstrate the code compliance of a building by comparing the energy performance of the proposed design with the code baseline, and (3) evaluate and compare design scenarios. For further details, the book Building Performance Simulation for Design and Operation (Hensen and Lamberts 2011) provides a comprehensive overview of how building performance simulation is used in the complete building life-cycle from conception to demolition. Note that although the use of BPS in the building design process is widespread, its use in the operation, control and retrofit of existing buildings remains limited. Figure 1 outlines a theoretical BPS ecosystem in which successful applications integrate users (i.e., energy modelers), programs, data and resource support. These three components are discussed further below. Figure 1 A theoretical Building Performance Simulation ecosystem integrates users, programs, data and resource support. Regarding BPS users, the Rocky Mountain Institute has developed the concept of ‘black belt energy modeling’ (Rocky Mountain Institute 2010) to set forth BPS user expectations, training materials, and professional development paths. Under this concept, becoming a master user requires a depth and breadth of knowledge about engineering, building science and BPS programs. Additionally, ASHRAE’s Fundamentals Handbook Chapter 19, Energy Estimating and Modeling Methods, covers fundamental concepts for energy modelers, particularly those new to the field. ASHRAE’s building energy modeling professional certification further ensures that BPS users have the training needed to develop and perform successful energy simulations. Regarding BPS programs, though many are available,2 no program is perfect in terms of accuracy and ease-of-use (Zhu et al. 2013; Zhou et al. 2014). Moreover, available BPS programs are used to answer a wide range of questions for architects, engineers and other stakeholders, and it is important to select a BPS program that is appropriate for the particular application of interest – indeed, this notion is the basis of the fit-for-purpose modeling concept (Gaetani et al. 2016). Stretching a BPS program beyond its intended scope of use should be avoided; this practice may lead to modeling errors and at minimum requires a deep understanding of the BPS program in question. Finally, regarding data and resource support, inadequate efforts to collect supporting data for BPS underpin the “Garbage In, Garbage Out” aphorism. When modeling new buildings, for example, users must anticipate how the building will be used and accurately specify design performance goals. When modeling existing buildings, on-site inspections and energy audits can be used to establish reliable input data for energy models. Sound data collection is not replaced by parallel efforts, e.g., model calibration that attempts to fine-tune key model input parameters. As data for many parameters are needed to build detailed energy models using BPS programs such as EnergyPlus (U.S. Department of Energy 2018a), user experience is needed to focus data collection around the most important model input parameters. Looking ahead, several studies have surveyed state-of-the-art in BPS research and highlighted key challenges and research items for future BPS development. For example, Hong et al. (2000) presented seven use categories of BPS and predicted continued BPS development in five areas: (1) integrating BPS with knowledge-based systems to support decision making, (2) using BPS in early design stage, (3) integrating information monitoring and diagnostic systems (Piette et al. 2001) with BPS for building energy management and control, (4) integrating multiple BPS programs in the building life cycle, and (5) using virtual reality technology to enable digital
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